Strength of conjugate base

Chemistry Level 2

Which of the following has the SECOND most weakest conjugate base?

HSbF_6

HBr

HCl

HI

HF

1 solution

Adhiraj Dutta
Apr 15, 2020

Order of acidic strength -

$HSbF_6$ $>$ $HI$ $>$ $HBr$ $>$ $HCl$ $>$ $HF$

Hence order of basic strength of conjugate base will be -

$SbF_6^-$ $<$ $I^-$ $<$ $Br^-$ $<$ $Cl^-$ $<$ $F^-$

How do you find the acidic strength for $HSbF_6$ ?

Richard Costen - 1 year, 1 month ago

Through its pKa value. Its of the order $-12$

Adhiraj Dutta - 1 year, 1 month ago

Why HSbF6 is more acidic than HI (pKa=10) ? Explain your answer.

Pradeep Tripathi - 1 year, 1 month ago

@Pradeep Tripathi – HI has pKa value $-10$ , while the pKa value of HSbF6 is $-12$ . Less is the pKa value more is the acidic strength.

Adhiraj Dutta - 1 year, 1 month ago